/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.withoutwords.ui.drawing;

import com.withoutwords.engine.Common;

import android.os.Bundle;
import android.app.Dialog;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ColorMatrix;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.Shader;
import android.graphics.SweepGradient;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.widget.LinearLayout;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;

public class DrawingSettingsDialog extends Dialog implements
		OnSeekBarChangeListener {

	public interface DrawingOptionsListener {
		void colorChanged(int color);

		void brushSizeChanged(int newSize);
	}

	private DrawingOptionsListener mListener;
	private SeekBar mSizeBar;
	private ColorPickerView mColorPickerView;
	private int mInitialColor;
	private float mInitialSize;

	private static class ColorPickerView extends View {
		private Paint mPaint;
		private Paint mCenterPaint;
		private final int[] mColors;
		private DrawingOptionsListener mListener;

		ColorPickerView(Context c, DrawingOptionsListener l, int color) {
			super(c);
			mListener = l;
			mColors = new int[] { 0xFFFF0000, 0xFFFF00FF, 0xFF0000FF,
					0xFF00FFFF, 0xFF00FF00, 0xFF000000, 0xFFFFFFFF, 0xFFFFFF00,
					0xFFFF0000 };
			Shader s = new SweepGradient(0, 0, mColors, null);

			mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
			mPaint.setShader(s);
			mPaint.setStyle(Paint.Style.STROKE);
			float stroke  = Common.adjustSize(52, c);
			mPaint.setStrokeWidth(stroke);

			mCenterPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
			mCenterPaint.setColor(color);
			stroke  = Common.adjustSize(5, c);
			mCenterPaint.setStrokeWidth(stroke);

			CENTER_X = (int)Common.adjustSize(BASE_CENTER_X, c);
			CENTER_Y = (int)Common.adjustSize(BASE_CENTER_Y, c);
			CENTER_RADIUS = (int)Common.adjustSize(BASE_CENTER_RADIUS, c);
		}

		private boolean mTrackingCenter;
		private boolean mHighlightCenter;

		@Override
		protected void onDraw(Canvas canvas) {
			
			
			
			float r = CENTER_X - mPaint.getStrokeWidth() * 0.5f;

			
			canvas.translate(CENTER_X, CENTER_X);

			canvas.drawOval(new RectF(-r, -r, r, r), mPaint);
			canvas.drawCircle(0, 0,  CENTER_RADIUS, mCenterPaint);

			if (mTrackingCenter) {
				int c = mCenterPaint.getColor();
				mCenterPaint.setStyle(Paint.Style.STROKE);

				if (mHighlightCenter) {
					mCenterPaint.setAlpha(0xFF);
				} else {
					mCenterPaint.setAlpha(0x80);
				}
				canvas.drawCircle(0, 0,
						CENTER_RADIUS + mCenterPaint.getStrokeWidth(),
						mCenterPaint);

				mCenterPaint.setStyle(Paint.Style.FILL);
				mCenterPaint.setColor(c);
			}
		}

		@Override
		protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
			setMeasuredDimension(CENTER_X*2,CENTER_Y*2);

		}

		private static final int BASE_CENTER_X = 150;
		private static final int BASE_CENTER_Y = 150;
		private static final int BASE_CENTER_RADIUS = 42;
		
		private int CENTER_X ;
		private int CENTER_Y ;
		private int CENTER_RADIUS ;

		private int floatToByte(float x) {
			int n = java.lang.Math.round(x);
			return n;
		}

		private int pinToByte(int n) {
			if (n < 0) {
				n = 0;
			} else if (n > 255) {
				n = 255;
			}
			return n;
		}

		private int ave(int s, int d, float p) {
			return s + java.lang.Math.round(p * (d - s));
		}

		private int interpColor(int colors[], float unit) {
			if (unit <= 0) {
				return colors[0];
			}
			if (unit >= 1) {
				return colors[colors.length - 1];
			}

			float p = unit * (colors.length - 1);
			int i = (int) p;
			p -= i;

			// now p is just the fractional part [0...1) and i is the index
			int c0 = colors[i];
			int c1 = colors[i + 1];
			int a = ave(Color.alpha(c0), Color.alpha(c1), p);
			int r = ave(Color.red(c0), Color.red(c1), p);
			int g = ave(Color.green(c0), Color.green(c1), p);
			int b = ave(Color.blue(c0), Color.blue(c1), p);

			return Color.argb(a, r, g, b);
		}

		private int rotateColor(int color, float rad) {
			float deg = rad * 180 / 3.1415927f;
			int r = Color.red(color);
			int g = Color.green(color);
			int b = Color.blue(color);

			ColorMatrix cm = new ColorMatrix();
			ColorMatrix tmp = new ColorMatrix();

			cm.setRGB2YUV();
			tmp.setRotate(0, deg);
			cm.postConcat(tmp);
			tmp.setYUV2RGB();
			cm.postConcat(tmp);

			final float[] a = cm.getArray();

			int ir = floatToByte(a[0] * r + a[1] * g + a[2] * b);
			int ig = floatToByte(a[5] * r + a[6] * g + a[7] * b);
			int ib = floatToByte(a[10] * r + a[11] * g + a[12] * b);

			return Color.argb(Color.alpha(color), pinToByte(ir), pinToByte(ig),
					pinToByte(ib));
		}

		private static final float PI = 3.1415926f;

		@Override
		public boolean onTouchEvent(MotionEvent event) {
			float x = event.getX() - CENTER_X;
			float y = event.getY() - CENTER_Y;
			boolean inCenter = java.lang.Math.sqrt(x * x + y * y) <= CENTER_RADIUS;

			switch (event.getAction()) {
			case MotionEvent.ACTION_DOWN:
				mTrackingCenter = inCenter;
				if (inCenter) {
					mHighlightCenter = true;
					invalidate();
					break;
				}
			case MotionEvent.ACTION_MOVE:
				if (mTrackingCenter) {
					if (mHighlightCenter != inCenter) {
						mHighlightCenter = inCenter;
						invalidate();
					}
				} else {
					float angle = (float) java.lang.Math.atan2(y, x);
					// need to turn angle [-PI ... PI] into unit [0....1]
					float unit = angle / (2 * PI);
					if (unit < 0) {
						unit += 1;
					}
					mCenterPaint.setColor(interpColor(mColors, unit));
					invalidate();
				}
				break;
			case MotionEvent.ACTION_UP:
				if (mTrackingCenter) {
					// if (inCenter)
					{
						mListener.colorChanged(mCenterPaint.getColor());
					}
					mTrackingCenter = false; // so we draw w/o halo
					invalidate();
				}
				break;
			}
			return true;
		}
		
		public int getSelectedColor()
		{
			return mCenterPaint.getColor();
		}
	}

	public DrawingSettingsDialog(Context context,
			DrawingOptionsListener listener, int initialColor, float initialSize) {
		super(context);

		mListener = listener;
		mInitialColor = initialColor;
		mInitialSize = initialSize;
	}

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		LinearLayout ly = new LinearLayout(getContext());
		ly.setOrientation(LinearLayout.VERTICAL);
		ly.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,
				LayoutParams.WRAP_CONTENT));

		mSizeBar = new SeekBar(getContext());
		ly.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT,
				LayoutParams.WRAP_CONTENT));
		ly.addView(mSizeBar);
		mSizeBar.setOnSeekBarChangeListener(this);
		mSizeBar.setProgress((int) mInitialSize);
		mSizeBar.setMax(30);

		mColorPickerView = new ColorPickerView(getContext(), mListener,
				mInitialColor);
		mColorPickerView.setPadding(20, 30, 20, 30);
		ly.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,
				LayoutParams.WRAP_CONTENT));
		ly.addView(mColorPickerView);

		setContentView(ly);

		// setTitle("Pick a Color");
	}

	@Override
	public void onProgressChanged(SeekBar seekBar, int progress,
			boolean fromUser) {
		mListener.brushSizeChanged(progress);

	}

	@Override
	public void onStartTrackingTouch(SeekBar seekBar) {
		// TODO Auto-generated method stub

	}

	@Override
	public void onStopTrackingTouch(SeekBar seekBar) {
		// TODO Auto-generated method stub

	}
	@Override
	public void onBackPressed() {
		 mListener.colorChanged(mColorPickerView.getSelectedColor());
		//super.onBackPressed();
	}
}
